7620621840 has 480 divisors, whose sum is σ = 29459364480. Its totient is φ = 1749786624.

The previous prime is 7620621839. The next prime is 7620621857. The reversal of 7620621840 is 481260267.

7620621840 is a `hidden beast` number, since 7 + 6 + 20 + 621 + 8 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7620621795 and 7620621804.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12982027 + ... + 12982613.

It is an arithmetic number, because the mean of its divisors is an integer number (61373676).

Almost surely, 2^7620621840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7620621840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14729682240).

7620621840 is an abundant number, since it is smaller than the sum of its proper divisors (21838742640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7620621840 is a wasteful number, since it uses less digits than its factorization.

7620621840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711 (or 702 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 7620621840 is about 87296.1731119984. The cubic root of 7620621840 is about 1967.8718065417.

The spelling of 7620621840 in words is "seven billion, six hundred twenty million, six hundred twenty-one thousand, eight hundred forty".